In a boiler, heat is transferred from the products of combustion to the steam. the temperature of the products of combustion decreases from 1100oc to 550oc while the pressure remains constant at 0.1 mpa. the average constant pressure specific heat of the products of combustion is 1.09 kj/kg-k. the water enters at 0.8 mpa, 150oc and leaves at 0.8 mpa, 250oc. determine the exergy destroyed for this process per kilogram of water evaporated.

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.